Class was started with a review of definitions and formulas involved with momentum. Impulse was defined as the change in momentum, and the impulse formula found to be force x time. Change in momentum being delta mv, we arrived at the formula that force x time = delta mv. The conservation of momentum before and after a reaction was shown to be the net momentum, with a change in time causing a lowering (or increasing) force. Extending time of contact a force has with something like a solid object, will lower the magnitude of the force. ( hit something soft rather than hard). The two types of collisions, elastic and inelastic were discussed, with examples to explain both.